[aoti][mps] Fix deduplication of kernels

[angelayi]

Stack from ghstack (oldest at bottom):

• [aoti][mps] Enable test_aot_inductor.py tests #155598
• [aoti][mps] Add fused_rms and sdpa_mps fallback ops #156844
• -> [aoti][mps] Fix deduplication of kernels #156843

Previously I was not correctly deduplicating kernels generated by mps, so it would generate multiple of the same kernel.

cc @voznesenskym @penguinwu @EikanWang @jgong5 @Guobing-Chen @XiaobingSuper @zhuhaozhe @blzheng @wenzhe-nrv @jiayisunx @ipiszy @chenyang78 @kadeng @muchulee8 @amjames @chauhang @aakhundov

[pytorch-bot]

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❗ 1 Active SEVs

There are 1 currently active SEVs. If your PR is affected, please view them below:

• VolumeLimitExceeded Issue for linux.2xlarge and linux.4xlarge

❌ 1 Cancelled Job, 2 Unrelated Failures

As of commit 28332e5 with merge base 1051b93 ():

CANCELLED JOB - The following job was cancelled. Please retry:

• Check Labels / Check labels (gh)

FLAKY - The following job failed but was likely due to flakiness present on trunk:

• inductor / linux-jammy-cpu-py3.9-gcc11-inductor / test (inductor_torchbench_cpu_smoketest_perf, 1, 1, linux.24xl.spr-metal) (gh) (similar failure)
  Process completed with exit code 1.

UNSTABLE - The following job is marked as unstable, possibly due to flakiness on trunk:

• pull / cuda12.8-py3.10-gcc9-sm75 / test (pr_time_benchmarks, 1, 1, linux.g4dn.metal.nvidia.gpu, unstable) (gh) (#153987)
  MISSING REGRESSION TEST

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[desertfire]

Add a test?

[pytorchmergebot]

Starting merge as part of PR stack under #156844